spec/fixtures/pages/window-open-hide.html (11 lines of code) (raw):
<html>
<body>
<script type="text/javascript" charset="utf-8">
var w = window.open('http://host', '', 'show=no');
if (w == null)
console.log('null');
else
console.log('window');
</script>
</body>
</html>